From 81a864545f7d948a881f5227700e5312c64f506e Mon Sep 17 00:00:00 2001
From: Travis Ralston <travisr@matrix.org>
Date: Wed, 17 Sep 2025 10:46:16 -0600
Subject: [PATCH] Matrix 1.16

---
 .../appendices/newsfragments/2193.feature     |   1 -
 .../newsfragments/2071.deprecation            |   1 -
 .../client_server/newsfragments/2071.feature  |   1 -
 .../newsfragments/2167.clarification          |   1 -
 .../newsfragments/2169.clarification          |   1 -
 .../newsfragments/2171.clarification          |   1 -
 .../client_server/newsfragments/2175.feature  |   1 -
 .../newsfragments/2177.clarification          |   1 -
 .../newsfragments/2179.clarification          |   1 -
 .../client_server/newsfragments/2187.feature  |   1 -
 .../newsfragments/2190.clarification          |   1 -
 .../newsfragments/2193.feature.1              |   1 -
 .../newsfragments/2193.feature.2              |   1 -
 .../newsfragments/2193.feature.3              |   1 -
 .../newsfragments/2193.feature.4              |   1 -
 .../newsfragments/2193.feature.5              |   1 -
 .../newsfragments/2195.clarification          |   1 -
 .../newsfragments/2204.clarification          |   1 -
 .../client_server/newsfragments/2206.feature  |   1 -
 .../client_server/newsfragments/2207.feature  |   1 -
 .../client_server/newsfragments/2210.removal  |   1 -
 .../newsfragments/2132.clarification.1        |   1 -
 .../newsfragments/2132.clarification.2        |   1 -
 .../internal/newsfragments/2157.feature       |   1 -
 .../internal/newsfragments/2160.clarification |   1 -
 .../internal/newsfragments/2172.clarification |   1 -
 .../internal/newsfragments/2182.clarification |   1 -
 .../internal/newsfragments/2189.clarification |   1 -
 .../internal/newsfragments/2205.clarification |   1 -
 .../newsfragments/2193.clarification          |   1 -
 .../newsfragments/2193.feature.1              |   1 -
 .../newsfragments/2193.feature.2              |   1 -
 .../newsfragments/2193.feature.3              |   1 -
 .../newsfragments/2193.feature.4              |   1 -
 .../newsfragments/2193.feature.5              |   1 -
 .../room_versions/newsfragments/2199.feature  |   1 -
 .../server_server/newsfragments/2207.feature  |   1 -
 config/_default/hugo.toml                     |   6 +-
 content/changelog/v1.16.md                    | 103 ++++++++++++++++++
 39 files changed, 106 insertions(+), 40 deletions(-)
 delete mode 100644 changelogs/appendices/newsfragments/2193.feature
 delete mode 100644 changelogs/client_server/newsfragments/2071.deprecation
 delete mode 100644 changelogs/client_server/newsfragments/2071.feature
 delete mode 100644 changelogs/client_server/newsfragments/2167.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2169.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2171.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2175.feature
 delete mode 100644 changelogs/client_server/newsfragments/2177.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2179.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2187.feature
 delete mode 100644 changelogs/client_server/newsfragments/2190.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2193.feature.1
 delete mode 100644 changelogs/client_server/newsfragments/2193.feature.2
 delete mode 100644 changelogs/client_server/newsfragments/2193.feature.3
 delete mode 100644 changelogs/client_server/newsfragments/2193.feature.4
 delete mode 100644 changelogs/client_server/newsfragments/2193.feature.5
 delete mode 100644 changelogs/client_server/newsfragments/2195.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2204.clarification
 delete mode 100644 changelogs/client_server/newsfragments/2206.feature
 delete mode 100644 changelogs/client_server/newsfragments/2207.feature
 delete mode 100644 changelogs/client_server/newsfragments/2210.removal
 delete mode 100644 changelogs/internal/newsfragments/2132.clarification.1
 delete mode 100644 changelogs/internal/newsfragments/2132.clarification.2
 delete mode 100644 changelogs/internal/newsfragments/2157.feature
 delete mode 100644 changelogs/internal/newsfragments/2160.clarification
 delete mode 100644 changelogs/internal/newsfragments/2172.clarification
 delete mode 100644 changelogs/internal/newsfragments/2182.clarification
 delete mode 100644 changelogs/internal/newsfragments/2189.clarification
 delete mode 100644 changelogs/internal/newsfragments/2205.clarification
 delete mode 100644 changelogs/room_versions/newsfragments/2193.clarification
 delete mode 100644 changelogs/room_versions/newsfragments/2193.feature.1
 delete mode 100644 changelogs/room_versions/newsfragments/2193.feature.2
 delete mode 100644 changelogs/room_versions/newsfragments/2193.feature.3
 delete mode 100644 changelogs/room_versions/newsfragments/2193.feature.4
 delete mode 100644 changelogs/room_versions/newsfragments/2193.feature.5
 delete mode 100644 changelogs/room_versions/newsfragments/2199.feature
 delete mode 100644 changelogs/server_server/newsfragments/2207.feature
 create mode 100644 content/changelog/v1.16.md

diff --git a/changelogs/appendices/newsfragments/2193.feature b/changelogs/appendices/newsfragments/2193.feature
deleted file mode 100644
index 317f317f..00000000
--- a/changelogs/appendices/newsfragments/2193.feature
+++ /dev/null
@@ -1 +0,0 @@
-Room IDs can now appear without a domain component in [room version 12](/rooms/v12), as per [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291).
diff --git a/changelogs/client_server/newsfragments/2071.deprecation b/changelogs/client_server/newsfragments/2071.deprecation
deleted file mode 100644
index 34beb7a7..00000000
--- a/changelogs/client_server/newsfragments/2071.deprecation
+++ /dev/null
@@ -1 +0,0 @@
-Deprecate `m.set_avatar_url` and `m.set_displayname` capabilities, as per [MSC4133](https://github.com/matrix-org/matrix-spec-proposals/pull/4133).
diff --git a/changelogs/client_server/newsfragments/2071.feature b/changelogs/client_server/newsfragments/2071.feature
deleted file mode 100644
index 96a2b0c4..00000000
--- a/changelogs/client_server/newsfragments/2071.feature
+++ /dev/null
@@ -1 +0,0 @@
-Update user profile endpoints to handle custom fields, and add a new `m.profile_fields` capability, as per [MSC4133](https://github.com/matrix-org/matrix-spec-proposals/pull/4133).
diff --git a/changelogs/client_server/newsfragments/2167.clarification b/changelogs/client_server/newsfragments/2167.clarification
deleted file mode 100644
index 99805f73..00000000
--- a/changelogs/client_server/newsfragments/2167.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Clarify that `format` is required if `formatted_body` is specified.
diff --git a/changelogs/client_server/newsfragments/2169.clarification b/changelogs/client_server/newsfragments/2169.clarification
deleted file mode 100644
index 49648401..00000000
--- a/changelogs/client_server/newsfragments/2169.clarification
+++ /dev/null
@@ -1 +0,0 @@
-The `latest_event` in an aggregated set of thread events uses the same format as the event itself.
diff --git a/changelogs/client_server/newsfragments/2171.clarification b/changelogs/client_server/newsfragments/2171.clarification
deleted file mode 100644
index 3ccb2333..00000000
--- a/changelogs/client_server/newsfragments/2171.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Fix various typos throughout the specification.
diff --git a/changelogs/client_server/newsfragments/2175.feature b/changelogs/client_server/newsfragments/2175.feature
deleted file mode 100644
index ddd71d27..00000000
--- a/changelogs/client_server/newsfragments/2175.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add `format` query parameter to `GET /state/{eventType}/{stateKey}` to allow fetching metadata of a specific state event.
diff --git a/changelogs/client_server/newsfragments/2177.clarification b/changelogs/client_server/newsfragments/2177.clarification
deleted file mode 100644
index 3ccb2333..00000000
--- a/changelogs/client_server/newsfragments/2177.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Fix various typos throughout the specification.
diff --git a/changelogs/client_server/newsfragments/2179.clarification b/changelogs/client_server/newsfragments/2179.clarification
deleted file mode 100644
index 3ccb2333..00000000
--- a/changelogs/client_server/newsfragments/2179.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Fix various typos throughout the specification.
diff --git a/changelogs/client_server/newsfragments/2187.feature b/changelogs/client_server/newsfragments/2187.feature
deleted file mode 100644
index 8eff7582..00000000
--- a/changelogs/client_server/newsfragments/2187.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add the `use_state_after` query parameter and `state_after` response property to `GET /sync`, as per [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/issues/4222).
diff --git a/changelogs/client_server/newsfragments/2190.clarification b/changelogs/client_server/newsfragments/2190.clarification
deleted file mode 100644
index aefb6604..00000000
--- a/changelogs/client_server/newsfragments/2190.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Clarify that clients should replace events with the most recent replacement by `origin_server_ts`.
diff --git a/changelogs/client_server/newsfragments/2193.feature.1 b/changelogs/client_server/newsfragments/2193.feature.1
deleted file mode 100644
index befb76d2..00000000
--- a/changelogs/client_server/newsfragments/2193.feature.1
+++ /dev/null
@@ -1 +0,0 @@
-When upgrading rooms to [room version 12](/rooms/v12), `additional_creators` may be specified on the [`POST /_matrix/client/v3/rooms/{roomId}/upgrade`](/client-server-api/#post_matrixclientv3roomsroomidupgrade) endpoint, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289).
diff --git a/changelogs/client_server/newsfragments/2193.feature.2 b/changelogs/client_server/newsfragments/2193.feature.2
deleted file mode 100644
index 280a83e6..00000000
--- a/changelogs/client_server/newsfragments/2193.feature.2
+++ /dev/null
@@ -1 +0,0 @@
-When creating rooms with [room version 12](/rooms/v12), the `trusted_private_chat` preset should merge the invitees into the supplied `content.additional_creators` in the resulting room, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289).
diff --git a/changelogs/client_server/newsfragments/2193.feature.3 b/changelogs/client_server/newsfragments/2193.feature.3
deleted file mode 100644
index 5f8b1fab..00000000
--- a/changelogs/client_server/newsfragments/2193.feature.3
+++ /dev/null
@@ -1 +0,0 @@
-In [room version 12](/rooms/v12), the power level of room creators is now infinitely high as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289).
diff --git a/changelogs/client_server/newsfragments/2193.feature.4 b/changelogs/client_server/newsfragments/2193.feature.4
deleted file mode 100644
index 98d8f126..00000000
--- a/changelogs/client_server/newsfragments/2193.feature.4
+++ /dev/null
@@ -1 +0,0 @@
-In [room version 12](/rooms/v12), room IDs no longer have a domain component as per [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291).
diff --git a/changelogs/client_server/newsfragments/2193.feature.5 b/changelogs/client_server/newsfragments/2193.feature.5
deleted file mode 100644
index e1b54e80..00000000
--- a/changelogs/client_server/newsfragments/2193.feature.5
+++ /dev/null
@@ -1 +0,0 @@
-When creating rooms with [room version 12](/rooms/v12), the initial power levels will restrict the ability to upgrade rooms by default, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289).
diff --git a/changelogs/client_server/newsfragments/2195.clarification b/changelogs/client_server/newsfragments/2195.clarification
deleted file mode 100644
index 0ac462ad..00000000
--- a/changelogs/client_server/newsfragments/2195.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Fix `/sync` flow referencing incorrect parameter to use with `/messages`.
diff --git a/changelogs/client_server/newsfragments/2204.clarification b/changelogs/client_server/newsfragments/2204.clarification
deleted file mode 100644
index 9f2bc503..00000000
--- a/changelogs/client_server/newsfragments/2204.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Clarify wording around the `world_readable` history visibility setting. Contributed by @HarHarLinks.
diff --git a/changelogs/client_server/newsfragments/2206.feature b/changelogs/client_server/newsfragments/2206.feature
deleted file mode 100644
index 17b16ac3..00000000
--- a/changelogs/client_server/newsfragments/2206.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add a profile field for a user's time zone, as per [MSC4175](https://github.com/matrix-org/matrix-spec-proposals/pull/4175).
diff --git a/changelogs/client_server/newsfragments/2207.feature b/changelogs/client_server/newsfragments/2207.feature
deleted file mode 100644
index 74c16ddb..00000000
--- a/changelogs/client_server/newsfragments/2207.feature
+++ /dev/null
@@ -1 +0,0 @@
-Invites and knocks are now expected to contain the `m.room.create` event in their stripped state entries, as per [MSC4311](https://github.com/matrix-org/matrix-spec-proposals/pull/4311).
diff --git a/changelogs/client_server/newsfragments/2210.removal b/changelogs/client_server/newsfragments/2210.removal
deleted file mode 100644
index c4fe42c2..00000000
--- a/changelogs/client_server/newsfragments/2210.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove unintentional intentional mentions in replies, as per [MSC4142](https://github.com/matrix-org/matrix-spec-proposals/pull/4142).
diff --git a/changelogs/internal/newsfragments/2132.clarification.1 b/changelogs/internal/newsfragments/2132.clarification.1
deleted file mode 100644
index 26f5d085..00000000
--- a/changelogs/internal/newsfragments/2132.clarification.1
+++ /dev/null
@@ -1 +0,0 @@
-Declare the Application Service Registration schema to follow JSON Schema spec 2020-12.
\ No newline at end of file
diff --git a/changelogs/internal/newsfragments/2132.clarification.2 b/changelogs/internal/newsfragments/2132.clarification.2
deleted file mode 100644
index 480b16ca..00000000
--- a/changelogs/internal/newsfragments/2132.clarification.2
+++ /dev/null
@@ -1 +0,0 @@
-Declare the event schemas to follow JSON Schema spec 2020-12.
\ No newline at end of file
diff --git a/changelogs/internal/newsfragments/2157.feature b/changelogs/internal/newsfragments/2157.feature
deleted file mode 100644
index 58571d8c..00000000
--- a/changelogs/internal/newsfragments/2157.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add "placeholder MSC" process definition.
\ No newline at end of file
diff --git a/changelogs/internal/newsfragments/2160.clarification b/changelogs/internal/newsfragments/2160.clarification
deleted file mode 100644
index 57f8b73e..00000000
--- a/changelogs/internal/newsfragments/2160.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Upgrade the docsy theme to version 0.12.0.
diff --git a/changelogs/internal/newsfragments/2172.clarification b/changelogs/internal/newsfragments/2172.clarification
deleted file mode 100644
index 53f01c68..00000000
--- a/changelogs/internal/newsfragments/2172.clarification
+++ /dev/null
@@ -1 +0,0 @@
-GitHub actions are now building the OpenAPI `spec/identity-service-api/api.json` file.
diff --git a/changelogs/internal/newsfragments/2182.clarification b/changelogs/internal/newsfragments/2182.clarification
deleted file mode 100644
index 82426693..00000000
--- a/changelogs/internal/newsfragments/2182.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Minor fixes to JSON schemas.
diff --git a/changelogs/internal/newsfragments/2189.clarification b/changelogs/internal/newsfragments/2189.clarification
deleted file mode 100644
index f1dc9ec4..00000000
--- a/changelogs/internal/newsfragments/2189.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Specify a correct spelling for "display name".
diff --git a/changelogs/internal/newsfragments/2205.clarification b/changelogs/internal/newsfragments/2205.clarification
deleted file mode 100644
index 76880f97..00000000
--- a/changelogs/internal/newsfragments/2205.clarification
+++ /dev/null
@@ -1 +0,0 @@
-Fix a grammatical typo on the Matrix Spec Process documentation page.
\ No newline at end of file
diff --git a/changelogs/room_versions/newsfragments/2193.clarification b/changelogs/room_versions/newsfragments/2193.clarification
deleted file mode 100644
index 39e25b5a..00000000
--- a/changelogs/room_versions/newsfragments/2193.clarification
+++ /dev/null
@@ -1 +0,0 @@
-In room versions 1 through 12, an event's `auth_events` have always needed to belong to the same room as per [MSC4307](https://github.com/matrix-org/matrix-spec-proposals/pull/4307).
diff --git a/changelogs/room_versions/newsfragments/2193.feature.1 b/changelogs/room_versions/newsfragments/2193.feature.1
deleted file mode 100644
index 88e57469..00000000
--- a/changelogs/room_versions/newsfragments/2193.feature.1
+++ /dev/null
@@ -1 +0,0 @@
-Add [room version 12](/rooms/v12) as per [MSC4304](https://github.com/matrix-org/matrix-spec-proposals/pull/4304).
diff --git a/changelogs/room_versions/newsfragments/2193.feature.2 b/changelogs/room_versions/newsfragments/2193.feature.2
deleted file mode 100644
index 995fe87b..00000000
--- a/changelogs/room_versions/newsfragments/2193.feature.2
+++ /dev/null
@@ -1 +0,0 @@
-Room IDs in room version 12 are now the event ID of the create event with the normal room ID sigil (`!`), as per [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291).
diff --git a/changelogs/room_versions/newsfragments/2193.feature.3 b/changelogs/room_versions/newsfragments/2193.feature.3
deleted file mode 100644
index 2a396a3e..00000000
--- a/changelogs/room_versions/newsfragments/2193.feature.3
+++ /dev/null
@@ -1 +0,0 @@
-Room creators are formalized in room version 12 and have infinitely high power level, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289).
diff --git a/changelogs/room_versions/newsfragments/2193.feature.4 b/changelogs/room_versions/newsfragments/2193.feature.4
deleted file mode 100644
index c9f22df1..00000000
--- a/changelogs/room_versions/newsfragments/2193.feature.4
+++ /dev/null
@@ -1 +0,0 @@
-State Resolution is updated in room version 12 to reduce the opportunity for "state resets", as per [MSC4297](https://github.com/matrix-org/matrix-spec-proposals/pull/4297).
diff --git a/changelogs/room_versions/newsfragments/2193.feature.5 b/changelogs/room_versions/newsfragments/2193.feature.5
deleted file mode 100644
index 6c1ee1fc..00000000
--- a/changelogs/room_versions/newsfragments/2193.feature.5
+++ /dev/null
@@ -1 +0,0 @@
-The default room version is now room version 12, though servers SHOULD keep using room version 11 for a little while, as per [MSC4304](https://github.com/matrix-org/matrix-spec-proposals/pull/4304).
diff --git a/changelogs/room_versions/newsfragments/2199.feature b/changelogs/room_versions/newsfragments/2199.feature
deleted file mode 100644
index 88e57469..00000000
--- a/changelogs/room_versions/newsfragments/2199.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add [room version 12](/rooms/v12) as per [MSC4304](https://github.com/matrix-org/matrix-spec-proposals/pull/4304).
diff --git a/changelogs/server_server/newsfragments/2207.feature b/changelogs/server_server/newsfragments/2207.feature
deleted file mode 100644
index f4b5ad38..00000000
--- a/changelogs/server_server/newsfragments/2207.feature
+++ /dev/null
@@ -1 +0,0 @@
-`invite_room_state` and `knock_room_state` now have additional requirements and validation depending on the room version, as per [MSC4311](https://github.com/matrix-org/matrix-spec-proposals/pull/4311).
diff --git a/config/_default/hugo.toml b/config/_default/hugo.toml
index e3777cc7..328c0d9e 100644
--- a/config/_default/hugo.toml
+++ b/config/_default/hugo.toml
@@ -61,13 +61,13 @@ copyright = "The Matrix.org Foundation CIC"
 [params.version]
 # must be one of "unstable", "current", "historical"
 # this is used to decide whether to show a banner pointing to the current release
-status = "unstable"
+status = "stable"
 # A URL pointing to the latest, stable release of the spec. To be shown in the unstable version warning banner.
 current_version_url = "https://spec.matrix.org/latest"
 # The following is used when status = "stable", and is displayed in various UI elements on a released version
 # of the spec.
-# major = "1"
-# minor = "15"
+major = "1"
+minor = "16"
 
 # User interface configuration
 [params.ui]
diff --git a/content/changelog/v1.16.md b/content/changelog/v1.16.md
new file mode 100644
index 00000000..e8c1f717
--- /dev/null
+++ b/content/changelog/v1.16.md
@@ -0,0 +1,103 @@
+---
+title: v1.16 Changelog
+linkTitle: v1.16
+type: docs
+layout: changelog
+outputs:
+  - html
+  - checklist
+date: 2025-09-17
+---
+
+## Client-Server API
+
+**Deprecations**
+
+- Deprecate `m.set_avatar_url` and `m.set_displayname` capabilities, as per [MSC4133](https://github.com/matrix-org/matrix-spec-proposals/pull/4133). ([#2071](https://github.com/matrix-org/matrix-spec/issues/2071))
+
+**Removed Endpoints**
+
+- Remove unintentional intentional mentions in replies, as per [MSC4142](https://github.com/matrix-org/matrix-spec-proposals/pull/4142). ([#2210](https://github.com/matrix-org/matrix-spec/issues/2210))
+
+**Backwards Compatible Changes**
+
+- Update user profile endpoints to handle custom fields, and add a new `m.profile_fields` capability, as per [MSC4133](https://github.com/matrix-org/matrix-spec-proposals/pull/4133). ([#2071](https://github.com/matrix-org/matrix-spec/issues/2071))
+- Add `format` query parameter to `GET /state/{eventType}/{stateKey}` to allow fetching metadata of a specific state event. ([#2175](https://github.com/matrix-org/matrix-spec/issues/2175))
+- Add the `use_state_after` query parameter and `state_after` response property to `GET /sync`, as per [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/issues/4222). ([#2187](https://github.com/matrix-org/matrix-spec/issues/2187))
+- When upgrading rooms to [room version 12](/rooms/v12), `additional_creators` may be specified on the [`POST /_matrix/client/v3/rooms/{roomId}/upgrade`](/client-server-api/#post_matrixclientv3roomsroomidupgrade) endpoint, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- When creating rooms with [room version 12](/rooms/v12), the `trusted_private_chat` preset should merge the invitees into the supplied `content.additional_creators` in the resulting room, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- In [room version 12](/rooms/v12), the power level of room creators is now infinitely high as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- In [room version 12](/rooms/v12), room IDs no longer have a domain component as per [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- When creating rooms with [room version 12](/rooms/v12), the initial power levels will restrict the ability to upgrade rooms by default, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- Add a profile field for a user's time zone, as per [MSC4175](https://github.com/matrix-org/matrix-spec-proposals/pull/4175). ([#2206](https://github.com/matrix-org/matrix-spec/issues/2206))
+- Invites and knocks are now expected to contain the `m.room.create` event in their stripped state entries, as per [MSC4311](https://github.com/matrix-org/matrix-spec-proposals/pull/4311). ([#2207](https://github.com/matrix-org/matrix-spec/issues/2207))
+
+**Spec Clarifications**
+
+- Clarify that `format` is required if `formatted_body` is specified. ([#2167](https://github.com/matrix-org/matrix-spec/issues/2167))
+- The `latest_event` in an aggregated set of thread events uses the same format as the event itself. ([#2169](https://github.com/matrix-org/matrix-spec/issues/2169))
+- Fix various typos throughout the specification. ([#2171](https://github.com/matrix-org/matrix-spec/issues/2171), [#2177](https://github.com/matrix-org/matrix-spec/issues/2177), [#2179](https://github.com/matrix-org/matrix-spec/issues/2179))
+- Clarify that clients should replace events with the most recent replacement by `origin_server_ts`. ([#2190](https://github.com/matrix-org/matrix-spec/issues/2190))
+- Fix `/sync` flow referencing incorrect parameter to use with `/messages`. ([#2195](https://github.com/matrix-org/matrix-spec/issues/2195))
+- Clarify wording around the `world_readable` history visibility setting. Contributed by @HarHarLinks. ([#2204](https://github.com/matrix-org/matrix-spec/issues/2204))
+
+
+## Server-Server API
+
+**Backwards Compatible Changes**
+
+- `invite_room_state` and `knock_room_state` now have additional requirements and validation depending on the room version, as per [MSC4311](https://github.com/matrix-org/matrix-spec-proposals/pull/4311). ([#2207](https://github.com/matrix-org/matrix-spec/issues/2207))
+
+
+## Application Service API
+
+No significant changes.
+
+
+## Identity Service API
+
+No significant changes.
+
+
+## Push Gateway API
+
+No significant changes.
+
+
+## Room Versions
+
+**Backwards Compatible Changes**
+
+- Room IDs in room version 12 are now the event ID of the create event with the normal room ID sigil (`!`), as per [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- Room creators are formalized in room version 12 and have infinitely high power level, as per [MSC4289](https://github.com/matrix-org/matrix-spec-proposals/pull/4289). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- State Resolution is updated in room version 12 to reduce the opportunity for "state resets", as per [MSC4297](https://github.com/matrix-org/matrix-spec-proposals/pull/4297). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- The default room version is now room version 12, though servers SHOULD keep using room version 11 for a little while, as per [MSC4304](https://github.com/matrix-org/matrix-spec-proposals/pull/4304). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+- Add [room version 12](/rooms/v12) as per [MSC4304](https://github.com/matrix-org/matrix-spec-proposals/pull/4304). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193), [#2199](https://github.com/matrix-org/matrix-spec/issues/2199))
+
+**Spec Clarifications**
+
+- In room versions 1 through 12, an event's `auth_events` have always needed to belong to the same room as per [MSC4307](https://github.com/matrix-org/matrix-spec-proposals/pull/4307). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+
+
+## Appendices
+
+**Backwards Compatible Changes**
+
+- Room IDs can now appear without a domain component in [room version 12](/rooms/v12), as per [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291). ([#2193](https://github.com/matrix-org/matrix-spec/issues/2193))
+
+
+## Internal Changes/Tooling
+
+**Backwards Compatible Changes**
+
+- Add "placeholder MSC" process definition. ([#2157](https://github.com/matrix-org/matrix-spec/issues/2157))
+
+**Spec Clarifications**
+
+- Declare the Application Service Registration schema to follow JSON Schema spec 2020-12. ([#2132](https://github.com/matrix-org/matrix-spec/issues/2132))
+- Declare the event schemas to follow JSON Schema spec 2020-12. ([#2132](https://github.com/matrix-org/matrix-spec/issues/2132))
+- Upgrade the docsy theme to version 0.12.0. ([#2160](https://github.com/matrix-org/matrix-spec/issues/2160))
+- GitHub actions are now building the OpenAPI `spec/identity-service-api/api.json` file. ([#2172](https://github.com/matrix-org/matrix-spec/issues/2172))
+- Minor fixes to JSON schemas. ([#2182](https://github.com/matrix-org/matrix-spec/issues/2182))
+- Specify a correct spelling for "display name". ([#2189](https://github.com/matrix-org/matrix-spec/issues/2189))
+- Fix a grammatical typo on the Matrix Spec Process documentation page. ([#2205](https://github.com/matrix-org/matrix-spec/issues/2205))